<!--  -->
<template>
<div>
     <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb> 

    <!-- 卡片视图 -->
    <el-card>
        <!-- 搜索框区域 -->
        <el-row :gutter="20">
            <el-col :span="8">
                <!-- clearable可以清空 clear事件清空时触发什么时间 -->
                <el-input placeholder="请输入内容" v-model="queryInfo.query" clearable @clear="getGoodsList">
                    <el-button slot="append" icon="el-icon-search" @click="getGoodsList"></el-button>
                </el-input>
            </el-col>
            <el-col :span="4">
                <el-button type="primary" @click="goAddPage">添加商品</el-button>
            </el-col>
        </el-row>

        <!-- 表格区域 -->
        <el-table :data="goodsList" border stripe>
            <el-table-column type="index"></el-table-column>
            <el-table-column
                prop="goods_name"
                label="商品名称">
            </el-table-column>
            <el-table-column
                prop="goods_price"
                label="商品价格" width="95px">
            </el-table-column>
            <el-table-column
                prop="goods_weight"
                label="商品重量" width="70px">
            </el-table-column>
            <el-table-column prop="add_time" label="创建时间" width="140px">
                <!-- 希望这一列进行自定义的渲染，就用作用域插槽 -->
                <!-- |是Vue的过滤语法，表示数据传入过滤器中函数处理并返回 -->
                <template slot-scope="scope">
                    {{scope.row.add_time | dataFormat}}
                </template>
            </el-table-column>
            <el-table-column label="操作" width="130px">
                <template slot-scope="scope">
                    <el-button type="primary" icon="el-icon-edit" size="mini"></el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeById(scope.row.goods_id)"></el-button>
                </template>
            </el-table-column>
        </el-table>

        <!-- 一般卡片视图里就有table，表格和分页搭配 -->
        <el-pagination
            @size-change="handleSizeChange"
            @current-change="handleCurrentChange"
            :current-page="queryInfo.pagenum"
            :page-sizes="[10, 20, 30, 40]"
            :page-size="queryInfo.pagesize"
            layout="total, sizes, prev, pager, next, jumper"
            :total="total">
        </el-pagination>
    </el-card>
</div>
</template>

<script>
export default {
    data() {
        return {
            // getGoodsList方法get里请求参数
            queryInfo:{
                query:'',
                // 第几页
                pagenum:1,
                //一页几条数据
                pagesize:10
            },
            // 返回数据里的goods
            goodsList:[],
            // 总共多少条数据
            total:0
        }
    },
    created(){
        this.getGoodsList()
    },
    methods:{
        // 根据分页获取商品列表数据
        async getGoodsList(){
            const {data:res} = await this.$http.get('goods',{params:this.queryInfo})
            if(res.meta.status != 200)
                return this.$message.error("获取商品列表失败");
            this.$message.success('获取商品列表成功')
            this.goodsList = res.data.goods
            this.total = res.data.total 
        },
        // 分页里size-change事件被触发的处理函数，这件事一触发就会拿到一个新的size
        handleSizeChange(newsize){
            this.queryInfo.pagesize = newsize
            this.getGoodsList()
        },
        handleCurrentChange(newnum){
            this.queryInfo.pagenum = newnum
            this.getGoodsList()
        },
        // 点击删除按钮，根据这一行的id进行删除
        async removeById(goods_id){
            const result = await this.$confirm('此操作将永久删除该数据, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
                }).catch(err=>err)
            if(result !== 'confirm'){
                return 
            }
            const {data:res} = await this.$http.delete(`goods/${goods_id}`)
            if(res.meta.status != 200){return this.$message.error("删除失败");}   
            this.getGoodsList()           
        },
        // 点击添加商品按钮，跳转到添加商品页面
        goAddPage(){
            // 编程试导航跳转 router路由实例
            this.$router.push('/goods/add')
        }
    }
}
</script>

<style  lang='less' scoped>

</style>